Papermaking apparatus



Aug. 7, 1951 A. A. LOWE PAPER MAKING APPARATUS Filed April 14, 1948 BY A f @M Patented Aug. 7, 1951 PAPERMAKING APPARATUS Allen A. Lowe, Glens Falls, N. Y., assignor to The Sandy Hill Iron & Brass Works, Hudson Falls, N. Y., a corporation of New York Application April 14, 1948, Serial No. 21,060

1 Claim.

This invention relates to paper making apparatus and is directed more particularly to head or flow box for Fourdrinier paper making machines.

The principal object of the invention is the provision of a flow box construction which will provide constant and uniform quantity of paper making material at the desired speed at all times onto the wire and is accomplished in a broad way by means which recirculates excess stock.

For the most efficient paper-making operation and to produce paper of the desired characteristics, uniform rate of flow and quantity is desired and necessary but is difficult if not impossible with prior art apparatus.

By way of explanation it may be said that in order to produce a certain paper it is necessary that there be a certain quantity of stock or fiber bearing water in relation to machine speed but changes in conditions seriously affect the results, in that varying conditions varies fiber distribution.

According to this invention, a predetermined number of gallons of stock passes through the head box at a predetermined rate of speed. The gallons required for the certain paper making operation are caused to pass beneath the slice onto the wire and the excess is recirculated whereby uniformity is assured.

With the foregoing and various other novel features and advantages and other objects of my invention as will become more apparent as the description proceeds, the invention consists in certain novel features of construction and in the combination and arrangement of parts as will be hereinafter more particularly pointed out in the claim hereunto annexed and more fully described and referred to in connection with the accompanying drawings wherein:

Fig. 1 is a longitudinal sectional elevational view through a flow box embodying the novel features of the invention; and

Fig. 2 is a rear elevational view of the flow box embodying the novel features of the invention.

Referring now to the drawings more in detail, the invention will be fully described.

A flow box is provided which has a lower wall 4, front wall 6, rear wall 8 and side walls such as I0.

A breast roll I2 is disposed adjacent a horizontal wall I4. A Fourdrinier wire I6 is supported by the roll I2 and a slice I8 is provided above the breast roll.

Paper making stock, water in which fibers are suspended, is caused to flow beneath the slice in the normal way.

A receptacle 20 is provided which may be disposed above the flow box as in Fig. 2, and it has one or more downtakes 22 leading into the lower side of the flow box. A valve 24 disposed in the downtake 22 may be adjusted up or down by hand Wheels 26 in threaded engagement with a rod 28 thereof to control the flow of paper making stock into the flow box which enters the receptacle through one or more inlets 30.

A vertically extending wall 32 is spaced from the rear wall 8 of the flow box to provide an upwardly extending passageway 34.

A downwardly extending wall 36 is spaced from the wall 32 and a wall 38 substantially parallel thereto is disposed between wall 6 and said wall 36 providing passageways 40, 42 and 43.

An overflow outlet 44 is provided in one side wall I0 and a pump 46 is connected thereto which has a discharge return conduit 48 connected to the receptacle 30. A valve 50 is provided in conduit 4l to control the flow of paper making material to said receptacle.

In operation paper making stock supplied receptacle, from a supply thereof, flows through conduit 22 under control of member 24 and into the flow box. The stock flows upwardly, downwardly and upwardly through passageways onto wall I4 and beneath slice I 6 onto the Wire.

Excess stocks flows into the passageway 43 and out outlet 44 so that it is delivered by pump 46 to the receptacle 2II.

By means of the invention the quantity and rate of flow of paper making material from passageway 42 is controlled to produce the desired results while excess material is recirculated.

The invention may be embodied in other spe cie forms without departing from the essential characteristics thereof. Hence, the present embodiments are therefore to be considered in all respects merely as being illustrative and not as being restrictive, the scope of the invention being indicated by the appended claim rather than by the foregoing description, and all modifications and variations as fall within the meaning and purview and range of equivalency of the appended claim are therefore intended to be embraced therein.

What it is desired to claim and secure by Letters Patent of the United States is:

A recirculating ow box construction for paper making stock comprising in combination, a ow box formed from secured together bottom and side and front and rear walls, said rear wall having a stock inlet adjacent said lower wall, said front wall terminating below the plane of the upper edges of said rear and side walls and having a horizontal wall extending outwardly and forwardly therefrom, a. slice between said side walls disposed over the horizontal wall and cooperating therewith to form an outlet for the stock, a primary vertical wall extending inwardly from said rear wall between said side walls and having an upper edge disposed below the plane of the upper edges of said rear and side walls for the passage thereover of the stock from the inlet, a secondary vertical wall disposed between said side walls and extending downwardly from the upper edges thereof and spaced from said first vertical wall, a tertiary vertical wall extending between said side walls and having an upper edge terminating substantially in the plane of the horizontal wall and spaced between said secondary vertical and` front walls, lower ends of said secondary and tertiary vertical walls being spaced upwardly from said lower wall and having connections therebetween forming an overflow passageway between said secondary and tertiary vertical walls, one of said side walls being provided with an overow outlet disposed in the lowermost area of the overflow passageway, a receptacle for stock, primary ypipe connections between said receptacle and the inlet, secondary pipe connections between said receptacle and the overflow outlet, and pump means in said secl Number way. y

Arm A. Lowa'. REFERENCES CITED The following references are of record in the le of this patent:

UNITED sTaTE's Pa'I'ijNTs Name Date 1,421,981 Murray July 4, 1922 2,384,912 Helin Sept. 18, 1945 OTHER REFERENCES Technical Association Papers, Series XVIII, pp. 311 to 316, The Influence of the Headbox and Slice on Sheet Formation, by Bearce.

Ser. No. 337,665, Bassler (A. P. CJ. published May 4, 1943. 

